我试图将一个$ .ajax()语句转换为es6 Promise并返回es6 promise。我的想法是,我将有一个创建,更新,删除对Microsoft Dynamics Web API的调用的应用程序层,它返回一个es6 Promise,以便我可以在多个页面上重用Create,Update,Delete调用。我已经阅读了关于es6 Promises的Google,MDN和David Walsh Blog文章以及几个SO问题,但我还没有完全详细说明这些细节。
在下面的代码中,当ExpenseUpload.js
调用expenseTransactionSetAPI.Create(newExpenseTransactionSet).then(...));
时,我看到执行转到then()
,但then()
内的任何内容都没有执行。我不太确定我需要做出哪些更改,以便我的代码执行实际处理then()
,我甚至不确定我是否正确使用es6 Promises。任何指导都将不胜感激。
"use strict";
requirejs.config({
bundles: {
'CCSEQ.WebAPI.js': ['Model/ExpenseTransaction', 'Model/ExpenseTransactionSet', 'API/ExpenseTransaction', 'API/ExpenseTransactionSet']
}
});
require(["Model/ExpenseTransaction", "Model/ExpenseTransactionSet", "API/ExpenseTransaction", "API/ExpenseTransactionSet"], function (ExpenseTransactionModel, ExpenseTransactionSetModel, ExpenseTransactionAPI, ExpenseTransactionSetAPI) {
let file;
$(document).ready(() => {
setupHandlers();
});
function setupHandlers() {
$("#csv-file").change((e) => {
file = e.target.files[0];
});
$("#btnUploadFile").click(() => loadFile());
}
function loadFile() {
Papa.parse(file, {
complete: (results) => {
ImportExpenseTransaction(results.data);
console.log("import complete");
}
});
}
function ImportExpenseTransaction(data) {
let newExpenseTransactionSet = new ExpenseTransactionSetModel.ExpenseTransactionSet();
newExpenseTransactionSet.SetName = $("#UploadName").val();
newExpenseTransactionSet.Month = $("#UploadMonth").val();
newExpenseTransactionSet.Year = $("#UploadYear").val();
newExpenseTransactionSet.ImportDate = new Date();
newExpenseTransactionSet.Status = 100000000;
let newExpenseTransactions = new Array();
data.forEach((expense) => {
if (expense[0] !== "PR EMP ID") {
let newRecord = new ExpenseTransactionModel.ExpenseTransaction();
newRecord. = expense[n];
... // Load other records like above
newExpenseTransactions.push(newRecord);
}
});
let expenseTransactionSetAPI = new ExpenseTransactionSetAPI.ExpenseTransactionSet();
let expenseTransactionAPI = new ExpenseTransactionAPI.ExpenseTransaction();
expenseTransactionSetAPI.Create(newExpenseTransactionSet).
then((data) => {
console.log(data);
console.log("Transaction Set Created");
expenseTransactionAPI.
Create(newExpenseTransactions[0]).
then(() => {
console.log("Transaction Created");
}).catch(() => {
console.log("failure");
});
}).catch(() => {
(data) => {
console.log(data);
console.log("failure");
}
});
}
});
define("API/ExpenseTransaction", ["require", "exports", "API/APIBase", "Model/ExpenseTransaction"], function (require, exports, APIBase_1, Model) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class ExpenseTransaction extends APIBase_1.APIBase {
constructor() {
super();
this.ConvertToEntity = (data) => {
let result = new Array();
for (let i = 0; i < data.length; i++) {
let newRecord = new Model.ExpenseTransaction();
newRecord.[field] = data[i]["fieldName"];
.
.
.
result[i] = newRecord;
}
return result;
};
}
Create(expense) {
return new Promise((resolve, reject) => {
$.ajax({
url: this.ExpenseTransaction,
type: "POST",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: JSON.stringify(expense.toJSON()),
success: (data) => { resolve(data); },
error: (data) => { reject(data); }
});
});
}
;
}
exports.ExpenseTransaction = ExpenseTransaction;
});
define("API/ExpenseTransactionSet", ["require", "exports", "API/APIBase", "Model/ExpenseTransactionSet"], function (require, exports, APIBase_2, Model) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class ExpenseTransactionSet extends APIBase_2.APIBase {
constructor() {
super();
this.ConvertToEntity = (data) => {
let result = new Array();
for (let i = 0; i < data.length; i++) {
let newRecord = new Model.ExpenseTransactionSet();
newRecord.[field] = data[i]["fieldName"];
.
.
.
result[i] = newRecord;
}
return result;
};
}
Create(expenseSet) {
return new Promise((resolve, reject) => {
$.ajax({
url: this.ExpenseTransactionSet,
type: "POST",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: JSON.stringify(expenseSet.toJSON()),
success: (data) => {
resolve(data);
},
error: (data) => {
reject(data);
}
});
});
}
;
}
exports.ExpenseTransactionSet = ExpenseTransactionSet;
});
//# sourceMappingURL=CCSEQ.WebAPI.js.map
答案 0 :(得分:7)
只需返回ajax个请求,它就会返回一个类似承诺的对象。
jQuery 1.5中$ .ajax()返回的jqXHR对象实现了 Promise接口,为它们提供所有属性,方法和 承诺的行为
Create(expense) {
return $.ajax({
url: this.ExpenseTransactionSet,
type: "POST",
contentType: "application/json; charset=utf-8",
dataType: "json",
data: JSON.stringify(expenseSet.toJSON())
});
}